Powerful supercontinuum vortices generated by femtosecond vortex beams with thin plates

TL;DR

This paper presents a method to generate high-power supercontinuum vortices from femtosecond vortex beams using thin fused silica plates, maintaining vortex phase profiles across a broad spectrum from 500 to 1200 nm.

Contribution

The study introduces a novel thin-plate scheme that preserves vortex phase profiles during supercontinuum generation, enabling efficient high-power vortex beams across a wide spectral range.

Findings

Supercontinuum vortices retain vortex phase from 500 to 1200 nm.

The scheme suppresses filamentation, maintaining vortex ring integrity.

High-power supercontinuum vortices are achieved with different topological charges.

Abstract

We demonstrate numerically and experimentally the generation of powerful supercontinuum vortices from femtosecond vortex beams by using multiple thin fused silica plates. The supercontinuum vortices are shown to preserve the vortex phase profile of the initial beam for spectral components ranging from 500 nm to 1200 nm. The transfer of the vortex phase profile results from the inhibition of multiple filamentation and the preservation of vortex ring with relatively uniform intensity distribution by means of the thin-plate scheme, where the supercontinuum is mainly generated from the self-phase modulation and self-steepening effects. Our scheme works for vortex beams with different topological charges, which provides a simple and effective method to generate supercontinuum vortices with high power.